Stator slot inner insulation framework with cooling oil duct

Abstract

The utility model discloses a stator slot internal insulation framework with a cooling oil duct, which comprises a base, a stator and a stator shield, the stator is arranged in the base, and the stator shield is arranged in the base and used for separating the stator; the stator comprises a stator iron core, windings, notch filler strips and slot wedges, the stator iron core is provided with a plurality of winding slots for installing the windings, the windings are respectively arranged in the two winding slots and are fixed in the winding slots through the notch filler strips and the slot wedges, and two sides of each winding slot are provided with a plurality of side cooling slots; the winding in the winding groove comprises a lower winding and an upper winding, and a filler strip is arranged between the lower winding and the upper winding; the stator slot inner insulation framework with the cooling oil duct is simple in structure, convenient and practical, and the side cooling slots are arranged on the two sides of the winding slot, so that a cooling medium cools the winding through the two sides of the winding, and the winding can be fully contacted with the cooling medium to ensure the maximum efficiency of cooling the winding.

Description

Technical Field

[0001] This utility model belongs to the field of motor stator cooling technology, specifically relating to an insulating frame with cooling oil channels inside the stator slot. Background Technology

[0002] High-power-density high-speed generators are used to complete the laboratory integration verification of megawatt-level hybrid electric propulsion systems. These generators are characterized by high operating speeds (12,000–20,000 rpm), high power density (>5 kW / kg), and harsh operating environments, making their design challenging. Therefore, while meeting the requirements for motor safety and reliability, new technologies and processes are employed to improve the overall performance of the motor.

[0003] An efficient cooling system is a key technology for achieving high power density permanent magnet motors. Because the stator winding has the highest loss density and lowest temperature resistance in a permanent magnet motor, achieving efficient cooling of the stator winding is both a key focus and a challenge in the design of the permanent magnet motor cooling system. There are many cooling methods for permanent magnet motor stator windings, but according to the cooling principles they follow, they can all be categorized into the following two types:

[0004] One type of cooling method primarily relies on conductive heat dissipation, such as stator water jacket cooling, stator yoke tube cooling, stator slot bottom tube cooling, and stator core oil circulation cooling. A common characteristic of these methods is that the cooling medium does not directly contact the stator windings; the heat from the motor windings is conducted layer by layer through various functional and structural components within the motor to the cooling components. The most critical factor determining the effectiveness of conductive heat dissipation is the distance between the heat source (stator windings) and the cold source (water pipes, water jackets, etc.). Although optimized design can shorten the distance between the heat and cold sources, direct contact is still not achieved, thus limiting the upper limit of conductive heat dissipation efficiency. Furthermore, the cooling pipes in conductive heat dissipation inevitably conduct electricity while conducting heat. Due to the leakage magnetic field within the motor slots, the conductive pipes cannot be freely arranged within the slots, thus preventing the acquisition of the maximum heat dissipation area.

[0005] The second type is cooling methods primarily based on convection heat transfer, including oil spraying at the motor winding ends, open ventilation, and water circulation within the conductors. These methods share the common characteristic of having the cooling medium (oil, air, water, etc.) directly contact the stator windings, directly removing heat through convection, resulting in high cooling efficiency. However, existing convection heat transfer methods have certain limitations. For example, while oil spraying at the winding ends is versatile, it only directly cools the motor winding ends; the core windings still dissipate heat through conduction, resulting in a generally poor overall cooling effect. Open ventilation cooling offers good cooling performance and a lightweight structure, but the internal components of the motor are in direct contact with the external environment, leading to poor environmental adaptability. Water circulation within the conductors provides excellent cooling, but it is only suitable for low-frequency, low-voltage, high-current motors with large single conductor cross-sectional areas and requires a dedicated deionized water system.

[0006] For high-power-density permanent magnet motors used in mobile platforms such as aircraft and armored vehicles, existing cooling systems based on conductive heat dissipation are insufficient to meet the cooling requirements of motors with high heat flux and high loss density. Meanwhile, existing cooling systems based on convective heat transfer have limitations in terms of versatility and environmental adaptability. Therefore, there is an urgent need to develop a novel motor cooling system based on convective heat transfer to overcome the shortcomings of existing cooling methods and further improve the power density of permanent magnet motor systems. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide an insulated frame in the stator slot with cooling oil channels. Its structure is simple, convenient and practical. By setting side cooling grooves on both sides of the winding slot, the cooling medium can cool the winding through both sides, so that the winding can fully contact the cooling medium to ensure maximum efficiency in cooling the winding.

[0008] A stator slot insulation frame with cooling oil channels includes a base, a stator, and a stator cover. The stator is disposed within the base, and the stator cover is disposed within the base and serves to separate the stator. The stator includes a stator core, windings, slot spacers, and slot wedges. The stator core has several winding slots for mounting the windings. The windings are respectively disposed in two winding slots and fixed in the winding slots by the slot spacers and slot wedges. Several side cooling slots are provided on both sides of the winding slots. The windings in the winding slots include a lower winding and an upper winding, and a spacer is disposed between the lower winding and the upper winding.

[0009] Preferably, the winding is square.

[0010] Preferably, the base includes a housing, an annular liquid outlet groove is formed on the outer wall of the housing, an annular sealing plate is provided on the annular liquid outlet groove, a plurality of oil outlet holes are formed on the inner wall of the housing, one end of the oil outlet hole is connected to the inside of the housing and the other end is connected to the annular liquid outlet groove, an oil inlet is provided on the housing, and an oil outlet is provided on the annular sealing plate.

[0011] Preferably, a bottom cooling groove is provided at the bottom of the winding slot.

[0012] Beneficial effects:

[0013] (1) The present invention provides an insulated frame with cooling oil channels in the stator slot. Its structure is simple, convenient and practical. By setting side cooling grooves on both sides of the winding slot, the cooling medium can cool the winding through both sides, so that the winding can fully contact the cooling medium to ensure maximum efficiency in cooling the winding.

[0014] (2) The stator slot insulation skeleton with cooling oil channel of this utility model isolates the stator and rotor through the isolation sleeve to form a stator sealing oil cavity. Both ends of the stator winding are directly immersed in the cooling lubricating oil, which can effectively enhance the end cooling effect. The cooling lubricating oil flows from one end of the winding through the stator insulation skeleton oil channel and enters the other end of the winding. At the same time, the stator sealing oil cavity adopts the "multi-path parallel oil inlet + multi-path parallel oil return" design to improve the circumferential cooling uniformity of the stator winding. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the motor structure;

[0016] Figure 2 This is a schematic diagram of the stator structure;

[0017] Figure 3 This is a schematic diagram of the winding structure;

[0018] 1-Base, 11-Outer shell, 12-Oil outlet, 13-Oil inlet, 14-Oil outlet, 15-Annular liquid outlet groove, 2-Stator, 21-Stator core, 22-Winding, 23-Winding slot, 24-Lower winding, 25-Padded strip, 26-Upper winding, 27-Side cooling groove, 28-Slot opening pad, 29-Slot wedge, 210-Bottom cooling groove, 3-Stator cover. Detailed Implementation

[0019] The embodiments of this utility model are further described below with reference to the accompanying drawings.

[0020] Example 1

[0021] like Figures 1 to 3As shown; a stator slot insulation frame with cooling oil channels includes a base 1, a stator 2, and a stator cover 3. The stator 2 is disposed within the base 1, and the stator cover 3 is disposed within the base 1 and serves to separate the stator 2. The stator 2 includes a stator core 21, windings 22, slot spacers 28, and slot wedges 29. The stator core 21 has several winding slots 23 for mounting the windings 22. The windings 22 are respectively disposed in two winding slots 23 and fixed within the winding slots 23 by the slot spacers 28 and slot wedges 29. Several side cooling slots 27 are provided on both sides of each winding slot 23. The winding 22 includes a lower winding 24 and an upper winding 26, with a spacer 25 provided between the lower winding 24 and the upper winding 26; the winding 22 is square; the base 1 includes a housing 11, with an annular liquid outlet groove 15 on the outer wall of the housing 11, an annular sealing plate provided on the annular liquid outlet groove 15, and a plurality of oil outlet holes 12 on the inner wall of the outer wall of the housing 11, one end of the oil outlet hole 12 communicating with the inside of the housing 11 and the other end communicating with the annular liquid outlet groove 15, an oil inlet 13 provided on the housing 11, and an oil outlet 14 provided on the annular sealing plate; a bottom cooling groove 210 is provided at the bottom of the winding groove 23.

[0022] Specifically, the cooling medium enters the space between the inner wall of the outer casing 11 and the stator cover 3 through the oil inlet 13. The cooling medium passes through the stator 2 and enters the space at the other end of the stator 2. Then, it enters the annular liquid outlet groove 15 through several oil outlet holes 12 and is finally discharged through the oil outlet 14 to complete the heat conduction and stator cooling effect. When the cooling medium passes through the stator 2, it passes through the gap between the winding 22 and the winding slot 23. At the same time, the flow rate of the cooling medium is increased through the side cooling groove 27, and the cooling speed at the bottom of the winding slot 23 is increased through the bottom cooling groove 210. The pad 25, the slot pad 28 and the slot wedge 29 are existing technologies and will not be described in detail here.

[0023] The specific embodiments of this utility model have been described in detail above, but they are merely examples, and this utility model is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to this utility model are also within the scope of this utility model. Therefore, all equivalent changes and modifications made without departing from the spirit and scope of this utility model are covered within the scope of this utility model.

Claims

1. A stator slot insulation frame with cooling oil channels, characterized in that: The machine includes a base (1), a stator (2), and a stator cover (3). The stator (2) is disposed within the base (1), and the stator cover (3) is disposed within the base (1) and serves to separate the stator (2). The stator (2) includes a stator core (21), windings (22), slot spacers (28), and slot wedges (29). The stator core (21) has several winding slots (23) for mounting the windings (22). The windings (22) are respectively arranged in two winding slots (23) and fixed in the winding slots (23) by slot spacers (28) and slot wedges (29). Several side cooling slots (27) are opened on both sides of the winding slots (23). The windings (22) in the winding slots (23) include a lower winding (24) and an upper winding (26). A spacer (25) is provided between the lower winding (24) and the upper winding (26).

2. The stator slot insulation frame with cooling oil channels as described in claim 1, characterized in that: The winding (22) is square.

3. The stator slot insulation frame with cooling oil channels as described in claim 2, characterized in that: The base (1) includes a housing (11), an annular liquid outlet groove (15) is provided on the outer wall of the housing (11), an annular sealing plate is provided on the annular liquid outlet groove (15), a plurality of oil outlet holes (12) are provided in the inner wall of the housing (11), one end of the oil outlet hole (12) is connected to the inside of the housing (11) and the other end is connected to the annular liquid outlet groove (15), an oil inlet (13) is provided on the housing (11), and an oil outlet (14) is provided on the annular sealing plate.

4. A stator slot insulation frame with cooling oil channels as described in claim 1 or 3, characterized in that: The bottom of the winding slot (23) is provided with a bottom cooling slot (210).

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